Exception in rendering!
Message: window is not defined
ReferenceError: window is not defined
at new c (/tmp/execjs20161208-102436-86rwogjs:136:3912)
at m.mountComponent (/tmp/execjs20161208-102436-86rwogjs:47:15602)
at /tmp/execjs20161208-102436-86rwogjs:49:31860
at a.r.perform (/tmp/execjs20161208-102436-86rwogjs:47:12503)
at Object.a [as renderToString] (/tmp/execjs20161208-102436-86rwogjs:49:31821)
at r (/tmp/execjs20161208-102436-86rwogjs:50:21164)
at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161208-102436-86rwogjs:32:6073)
at eval (eval at <anonymous> (/tmp/execjs20161208-102436-86rwogjs:173:8), <anonymous>:10:23)
at eval (eval at <anonymous> (/tmp/execjs20161208-102436-86rwogjs:173:8), <anonymous>:17:3)
at /tmp/execjs20161208-102436-86rwogjs:173:8

Brake pedal slowly becomes firm to press after short period of driving

Q:
Brake pedal slowly becomes firm to press after short period of driving

asked by
Greg W
on
October 18, 2016

I had an issue with one of my rear rotors / pads, so I replaced both rear pads and rotors. I plan to do the front ones tomorrow, but i'm having an issue with the pressure building up in the brake system. The brake pedal gets firm / hard to press down after maybe 5-10 minutes of driving.
When this happens it feels like the brakes are constantly being applied, and I will have to press the pedal down pretty hard to be able to shift into reverse.
If the car sits parked for awhile the pressure slowly goes back to normal. My initial research tells me that this could be due to a bad / damaged flex hose.
Not sure if bleeding the lines / air in the system could possibly cause too much pressure as opposed to too little. I will bleed the system when i'm doing the front brakes tomorrow anyways, but just looking for some input with this problem.

My car has 116000 miles.
My car has an automatic transmission.

A: Hello and thank you for your question.
The ...

Hello and thank you for your question.
The problem lies within the proportioning valve in the brake system. The valve could be plugged up with debris in the system making the valve stick. If the proportioning valve is okay and working correctly, then the brake controller plungers has some debris in the system. I suggest getting two large bottles of brake fluid Dot 3 and flushing out the entire system with all new brake fluid. This will help remove any debris in the system and help keep the system clean. If the system is still being pressurized after flushing out the entire brake system, then you may have to replace the proportioning valve or brake controller to keep the system from building up. If you need assistance with diagnosing your brake system, then seek out a professional, preferably a professional from Your Mechanic to help you with your brake system.

Get an instant quote for your car

What others are asking

It sounds like you have failed cooling fans. When the car is at idle, the fans should run to pull air across the A/C condenser to regulate refrigerant temperatures and the radiator to regulate coolant temperature. If these fans fail,...

Q: When driving the car it feels like it's gone into a higher gear.

Hello, thanks for writing in. Is your Check Engine Light illuminated? Your description sounds like your transmission may be in "limp mode" which is usually 2nd gear in many transmissions. It is also possible that the sensation you are getting...

Q: Trouble starting and accelerating

Hi there, thanks for writing in about your 2002 Hyundai Elantra. There are several possibilities here that require further research. First off, it sounds like your transmission is in "limp" mode, which causes it to start off in 2nd gear...

Related articles

Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...